Question

Find the value of x.

• A. ${90}^{\circ }$
• B. ${30}^{\circ }$
• C. ${120}^{\circ }$
• D. ${60}^{\circ }$

Answer 1

The correct option is D

${60}^{\circ }$

If two sides of a triangle are equal in length, then it is called an isosceles triangle. Hence, the angles opposite the equal sides are also equal.

$\Rightarrow \angle B=\angle C$

From the given figure,
$\angle B={60}^{\circ }\text{and}\angle C=x$
$\text{So,}x={60}^{\circ }$